MIC68220
Dual 2A LDO Regulator
General Description
The MIC68220 is a dual high peak current LDO regulator
designed specifically for powering applications such as
FPGA core voltages that require high start up current with
lower nominal operating current. Capable of sourcing 2A of
current per channel for start-up, the MIC68220 provides
high power from a small MLF™ leadless package. The
MIC68220 can also implement a variety of power-up and
power-down protocols such as sequencing, tracking, and
ratiometric tracking.
The MIC68220 operates from a wide input range of 1.65V
to 5.5V, which includes all of the main supply voltages
commonly available today. It is designed to drive digital
circuits requiring low voltage at high currents (i.e. PLDs,
DSP, microcontroller, etc.). The MIC68220 incorporates a
delay pin (Delay) for control of power on reset output
(POR) at turn-on and power-down delay at turn-off. In
addition there is a ramp control pin (RC) for either tracking
applications or output voltage slew rate adjustment at turn-
on. This is important in applications where the load is
highly capacitive and in-rush currents can cause supply
voltages to fail and microprocessors or other complex logic
chips to hang up.
The MIC68220’s can be configured in two modes. In
tracking mode, the output voltage of Vout1 drives the RC2
pin so that the Vout2 tracks Vout1 during turn-on and turn-
off. In sequencing mode, POR1 of Vout1 drives the enable
pin (EN2) of Vout2 so that it turns on after the Vout1 and
turns off before (or after) Vout1. This behavior is critical
for power-up and power-down control in multi-output
power supplies. The MIC68220 is fully protected offering
both thermal and current limit protection, and reverse
current protection.
The MIC68220 has a junction temperature range of
-40°C to +125°C and is available in an adjustable Vout1 &
Vout2 version. The MIC68220 is offered in a low profile
4mm x 5mm 20ld MLF
®
package.
Features
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Stable with 4.7uF ceramic output capacitor
Input voltage range: 1.65V to 5.5V
0.5V reference
+1.0% initial output tolerance
2A maximum output current – peak start up
1A Continuous Operating Current
Tracking on turn-on and turn-off with pin strapping
Timing Controlled Sequencing On/Off
Programmable Ramp Control™ for in-rush current
limiting and slew rate control of the output voltage on
Turn-On
Power-on Reset (POR) supervisor with programmable
delay time
Single Master can control multiple Slave regulators
with tracking output voltages
Tiny 4mm x 5mm MLF
®
package
Maximum dropout (V
IN
– V
OUT
) of 400mV over
temperature at 1A output current
Adjustable Output Voltages
Excellent line and load regulation specifications
Logic controlled shutdown
Thermal shutdown and current limit protection
Applications
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FPGA/PLD Power Supply
Networking/Telecom Equipment
Microprocessor Core Voltage
High Efficiency Linear Post Regulator
Sequenced or Tracked Power Supply
MLF and
MicroLeadFrame
a registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2010
M9999-092310-C
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